Has my child got chickenpox ?

my little girl who is 5 years old has just been sent home from school with aching back and legs, and a high temp. when my husband picked up my little girl the teacher told him that chickenpox is going around the school, she has had all her imms but im not sure if she has them as there is no rash. i am 18 wks pregnant and know there is only a small risk to my unborn child but would feel a little better knowing if my little girl had chickenpox.